What's the best way to change a lawn mower's oil? (push and rider)

[bertsmobile1]

Awefull lot of engine now with no sump plug.
Then even more where the blade clutch covers the drain so it is impossible to remove the bolt
Then if you do the impossible the the clutch ends up being soaked in hot oil.

 

[mechanic mark]

Three options, take to mower shop, hire a lawn service, or buy battery operated mower.